Tire-valve.



H. P. KR AFT.

TIRE VALVE. APPLCATION FILED JUNE 15. !9I6.

. 1,290,532, Patented Jan. 7,1919.

INVENTOR WITNESSES; By Attorneys in the rubber packing.

gi ls ATNT fih' i littiid.

HENRY P. KRAFT, OE RIDGEWOOD, NEW JERSEY.

TIRE-VALVE.

Original application filed July 25.'1$14, Serial No. 853,126. Divided and Seria1'No.103 .847.

1 i/ all 'w/w/uit ma 1 conccrn. 4

lie it known that I. HENRY l Kant-"r, a

citizen of the l nited States of America. re-

specification.

This apphcation is a dlvision of my application filed July 25. 1914. No. 853.126.

This invention relates to tire valves, and aims to provide certain improvements therein.

. The invention isdirected toward that form of tire or other valve which normally has a spring, pressing the valve to its seat. although it may be used in connection with valves which are loosely mounted. and require air or other pressure to close them in use. Springpressed valves have very largely gone into use for pneumatic tires or similar purposes. the spring;- being desirable to insure tight closing of the valve, particularly under low pressures. In tire valves or other small valves. particularly of the Srhrader type, the valve mechanism. comprising a valve proper and its seat, are removable bodily from the shell or casing, and'the spring is placed under tension during the act of insertion. proper is necessarily very small, and its seating face is composed of rubber which by reason of the small size of the valve proper cannot be made of large dimensions. Practice has shown that the packing of the valve must be more or less resilient, and a comparatively soft rubber is hence used for this purpose.

It has been found in practice that with this type of valve the pressure of the valve against its seat is apt to form a depression This is necessary in the operation of the valve in use. but while the valve is not in use such pressure is detrimental. After the valves are manufactured considerable time often elapses before they go into use and it is the object of the present invention to provide means for depressing the valve to hold it away from its seat during such time, so that when the valve isput in use the valve packing-still has a smooth and eflicient seating surface. Such means must necessarily be very cheap and sufliciently strong and durable to withstand the ordinary shocks of transportation and handling.

Specification of Letters Patent.

In such valves the valve.

Patented Jan, *7, 1915i. this application filed June 15,

In the drawings which illustrate the invention,

l igure l a diametrical section valve with my invention in place thereon;

Fig. 2 is an elevation of'the upper part of Fig. 1;

Fig. 3 isa diametrical section of a similar construction: and I Fig. i is a similar section of another construction.

Referring to the drawings, let A indicate a tire valve which comprises a shell B of suitable dimensions having an internal screw-thread C at its top and an external screw-thread D also at its top. E is the. valve seat which is provided with a'packing F of rubber or other suitable material. and G is a screw-threaded plug which is swiveled to the seat member E. so that when the plug G is screweddown within the shell it presses the seat downwardly until the packing F makes contact with a tapered of the shoulder H. J is the valve proper which is erably running through the valve proper J. The lower end of the pin passes through a sheet metal guide 0 between which' and the valve proper is located a loading sprin P. The top of the pin L is upset or swage as shown at M, and its bottom is similarly upset or swaged, as shown at N. The pin acts to hold all of the parts together, and as its ends are enlarged by the swaged portions M and N. none of the parts can become separated. The spring P normally presses the valve proper J upwardly, so that the packing K is always in contact with the seat E except when the valve is depressed during the pumping operation. This constant contact of the packing K and seat E is injurious to the packing. It cannot be avoided when thevalve is in use, but while the valve is being carried in stock or before it is used, this contact is unnecessary and injurious to the packing of the valve, often causing leaka e.

According to the invention illustrated, there is provided-a depressor Q which is adapted to maintain the valve away from its seat as shown in Fig. 1. In this construction the depressor is-in the form of a cap having a central depressed portion R 'tering with the screwing on of the which preferably projects to a slight extent gages the interior wall of the valve nipple,

being preferably provided with projecting portions T to aid it. in this action.

In Fig. i is shown a construction which is adapted for use in connection with valves having opposite fiat surfaces. In this constrnction the depressor is formed as a strip of metal U having a depressed portion U and arms V, the arms being sutticiently thin to lie along the fiat portions without intervalve cap W.

W hen the valve is about to he placed in use in a tire, the depressor is best so con structed that air will leak out of the valve so that if the tire is inflated and the depressor is inadvertently retained. the air Within the tire will be permitted to escape. This shows at once that the depressor is intended to be removed and avoids the possibility of the user forming a slow-leaking connection Which would cause deflation of the tire When the car is in motion.

While. I have shown and described several forms of the invention, it will be under naeopse stood that I do not wish to be limited thereto since various changes may he made therein without departing from the invention.

' l/"Vhat I claim is 1. A tire valve depressor formed of a single piece of fiat sheet metal, having arms formed by bending the metal adapted'to flativise engage the top of the tire valve, and a portion extending across the top of the valve and adapted to press down the valve pin.

A tire valve depressor formed of a single piece of flat sheet metal, having arms formed by bending the metal adapted to flat- Wise engage the exterior portion of the top of the tire valve, and a bent in. depressed portion extending Within the top of the valve and adapted to press down the valve pin.

3. The combination of a tire valve having flat surfaces, of a depressor adapted to engage the valve pin and having arms engagin said fiat surfaces, said arms being of so 'cient thinness to lie between the valve cap and the valve body, whereby the cap may engage the body while the depressor 1s in place.

4. A tire valve depressor formed of a single piece of sheet metal having elastic arms adapted to frictionally engage the top of the tire valve, and having a portion extending across the top of the valve and adapted to press down thevalve pin.

In Witness whereof, I have hereunto HENRY P. KRAFT.

- sign ed my name. 

